Pumping-jack.



No. 643,832.- Patent ed Feb. 20, I900.

J. w., sw u. PUMPING JAGK.

(Application filed July 25, 1898.) (No Model.)

2 Sheets-Sheet v I WITNESSES. r

I JB/mWjwan,

No. 64 3,832I Patented Feb. 20, I900.

. .1. w. SWAN.

PUMPING JACK. (Application filed July 25, 1898.) (No Model.) 2 SheetsSheet'2 WITNESSES. mvsufoa, r Wjwan Z (513W. 3)

UNITED STATES PATENT OFFICE.

JOHN W. SWAN, or LIMA, onto.

PUM PING-JACK.

SPECIFICATION forming part of Letters Patent No. 643,832, dated February 20, 1900.

' Application filed July 25, 1898.

To a whom, it may concern:

Be it known that I, JOHN W. SWAN, a citizen tached to or detached from the polish-rod and.

swung or folded out of the way without detaching or moving the jack from its support or disconnecting it from the surface-rod, thus facilitating the removal from the well of the sucker-rod and like operations. I attain these objects by means of the mechanism and ar-' rangement of parts hereinafter described, and shown and illustrated in the accompanying drawings, made part hereof, in which Figure 1 is a perspective view of my device in place and operatively connected with the pumping-rod at half-stroke; Fig. 2, the same, showing the jack disconnected from the pum ping-rod and folded back out of the way to permit the withdrawal of the pumping-rods from the well; Fig. 3, a side elevation, partly in section, of the pump-rod clamp hereinafter referred to; and Fig. 4, a front edge elevation of the hook or finger hereinafter referred to.

Like numerals and letters of reference indicate like parts throughout the drawings.

In the drawings, 1 is a clamping'piece hollowed and recessed on one side to fit and receive the casing-head. The piece 1 is provided with lugs 2 2, bored horizontally to receive the extremities of loop 3, which embraces the casing-head. The extremities of this loop are threaded, as at 4, and provided with nuts 5. When these nuts are set up, the piece 1 and loop 3 clamp the casing-head, and the piece He thus supported and held rigidly and immovably in place. Projecting upwardly from the piece 1 are lugs or ears 6, bored horizontally, through which bore passes a stout pin 7, which forms a fulcrum for bellcrank lever 8. This bell-crank lever is double-that is to say, it is composed of two trian gularparts or frames placed side by side and Serial No. 686,761. (No model.)

separated sufficiently to allow room for the vertical play of the pump-rod between them while the skeleton bell-crank lever swings without interference with the pump-rod or tubing.

The pieces or bars composing the bell-crank lever are designated in the drawings as follows: the upright bars a, the inclined bars I), and the horizontal bars 0. The pieces a c at their meeting-points are rigidly secured to plates 9, through downwardly-proj ectin g lugs of which passes the pin 7. The pieces a b at their meeting-points are bolted to and rigidly connected with plates 10. Both bars of each of the pieces I) c are connected at their meeting-point by the bolt 11. To the plates is pivotally secured by means of bolt 13 the horizontally reciprocating surface rod 12, which leads to and is connected with a suitable source of power. The plates 10 are provided with a series of holes for the bolt 13, one above the other, as at 14, so that by changing the point of connection of the bell-crank lever with the surface-rod, the stroke of which is constant and uniform, the length of stroke of the lever may be lengthened or shortened, as desired.

15 15 are two plates,which by means of bolts and nuts 16 16 are clamped upon the polishrod A at any desired point. The bottom of these plates is formed into a slightly-curved plane,from which downwardly projects a cone 17, concentric with the polish-rod, each plate furnishing a half of the cone. When the device is in operation, the curved lower surface of the plates 15 rests and rocks upon the top of'the jaw-piece 18, and the cone 17 projects into a conical socket, somewhat larger than the cone, in the top of the jaw-piece. 19 19 are stout lift-bars having eyes at their lower extremities, through which eyes passes the bolt 11 and by means of which the lift-bars 19 are pivotally secured to the bell-crank lever at its angle 1) 0. At top the bars 19 are rigidly secured to the jaw-piece 18.

2O 20 are bars or braces pivoted, as at 20, upon the plates 9. This pair of lift-bars ex tends from its lower pivotal point 20 upwardly at an angle to the vertical, as shown, and at top are pivotally connected, as at 21, to one extremity of bar or rod 22, forming a tie or reach, which at its other extremity is pivotally connected, as at 23, with the jawpiece 18. The tie or reach 22 is rigidlysocketed in piece 22, through which piece the bolt 21 passes and which piece has a vertical opening. Pivotally secured to the floor of the pumping-house, as at 24, is a rod 25, passing upwardly through the opening just referred to in the piece 22, where the rod 25 and the piece 22 are ad justably fixed together by means of a set-screw 26.

The operation of my device thus far described is as follows: Horizontal motion being given to the surface-rod 12, bell-crank lever 8 oscillates upon its fulcrum 7, causing the bars 19 to reciprocate. Each upward stroke of these bars through jawpiece 18 and head 15 lifts the polish-rod A, and thus operates the pump in the Well. The upward thrust of the bars 19 at an angle to the vertical tends to and would push the polish-rod to one side, and the rod would be bent were it not for the counteracting draft of the bar 22, which, swinging on its pivot 21, pulls in a direction opposite the side thrust of the liftbar 19. The are described by the end of brace 22 next the lift-bar 19 tends to and would throw the polish-rod out of vertical alinement; but this are is resolved into a straight line by means of the longitudinal movement of the bar 22, which movement is accomplished by the swinging of brace 20 on its pivot 20 and by the swinging of the floorrod 25 on its pivot 24. It will be seen that the resultant of the movements of the bellcrank lever 8, the lift-bar 19, the tie-rod 22,

' the brace 20, and the floor-rod 25 is the vertical movement of the polish-rod in a right line.

The jaw-piece 18 at the upper extremity of the lift-bar at its side next the polish-rod is bifurcated or recessed, so that when the bar 19 is swung on its pivot 11 the polish-rod will enter or leave the recessed portion of the jaw-piece without interference. The clamping-piece 15 is provided with a latch 15, pivoted upon bolt 16, the latch being adapted to swing downwardly into the recess between the jaws of the piece 18. Upon the latch are laterally-projecting lugs 15, which when the latch is thrown downwardly engage corresponding lugs15, projecting inwardly toward each other from the jaws of the piece 18. (See Figs. 2 and 3.) Ordinarily the weight of the polish-rod and the suspended pumping-rods will be sufficient to support the clamping-piece 15 in position upon the jaw-piece 18; but in case the pump or well should become fouled with paraflin considerable force is sometimes required to push the pump-rod down. In such case the latch 15 upon the clamp 15 is engaged with the jaw-piece 18, and the polish-rod will now be forced in both directions in its vertical stroke.

lVhen it becomes necessary to withdraw the rods from the well, it is only necessary to loosen the set-screw 26 at the meeting-point of the floor-rod 25 and tie-bar 22 and to throw the latch 15 out of engagement with the jawpiece 18. The bell-crank lever may now be swung outwardly and the pieces 19, 20, 22, and 25 may be folded backwardly upon the floor of the pumping-house out of the way, as shown in Fig. 2, which operation is the work of but a moment.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a pumping-jack, a casing-head clamp, a bell-crank lever fulcrumed thereon, means for securing a surface-rod thereto, a polishrod clamp, a lift-bar pivoted at its lower end upon the bell-crank lever and at its upper end operatively connected with the polishrod clamp, a brace pivoted at its lower end upon the bell-crank lever and extending upwardly at an angle to said lift-bar, a tie rod or reach pivotally connected at one end to the upper end of the lift-bar and pivotally connected at its opposite end with said brace, and means for pivotally connecting said brace and tie with the floor or ground.

2. In a pumping-jack a polish-rod clamp, a latch or hook pivoted upon said clamp, ajawpiece vertically bifurcated or recessed at one side to receive a polish-rod, means within said recess or bifurcation for engaging said latch or hook, and means for imparting to said jaw-piece a vertical movement.

3. A pumping-jack comprising a casinghead clamp, a bell -crank lever fulcrumed thereon, means for connecting a surface-rod to the bell-crank lever, a polish-rod clamp, a jaw-piece vertically bifurcated or recessed at one side to receive the polish-rod, means for detachably engaging the polish -rod clamp with the jaw-piece, a lift-bar connecting the bell-crank lever with the jaw-piece, a brace pivoted at its lower end upon the bell-crank lever and extending upwardly at an angle to the lift-bar, a tie rod or reach pivoted at one end to the jaw-piece and atits other end pivoted to the upper end of the brace, a floor-rod adapted to be pivotally secured at bottom, and means for detachably connecting said floor-rod at top with the brace and tie at their meeting angle.

JOHN W. SWAN. In presence of- R. 0. WARNER, GIBsoN P. DILDINE. 

